Hello,
In looking at your piece, I would say the attribution you found is incorrect. Flavio Poli & Sommerso glass seem to be to Italian, as Powolny and Tango is to Bohemian. Every piece of two colored (or close) Bohemian glass is Loetz by Powolny, and it seems that almost all Sommerso Italian glass is attributed to Flavio Poli.
Poli's work is much cleaner and architectural than this form is. His style is known for, in many ways, understated elegance and simplicity executed perfectly. Many of his designs can be described as "architectural forms". I do not know that I can remember having ever seen a known Poli design with a foot such as this on it. They may be out there, but I have not a recollection of having seen one.
If you believe the internet, Poli designed 75%, if not more, of the Sommerso glass in existence.
It is a pretty piece, but IMHO I would keep looking as far as attribution goes. If you have a black light, the reaction the outer light green casing has may provide information as to time frame for the item.
Craig